Question 1

What is occurring during this period of a muscle twitch contraction?

Accepted Answer

A)  The muscle action potential sweeps along the sarcolemma and calcium ions are released from the sarcoplasmic reticulum. 
B)  Crossbridge attachments form, and repetitive power strokes occur. 
C)  The level of Ca2+ in the sarcoplasm decreases, because it is being actively transported back into the sarcoplasmic reticulum and bound to calsequestrin. 
D)  The muscle fiber relaxes as myosin heads detach from the actin filaments. 
E)  Acetylcholinesterase is preventing the ligand gated channels at the motor end plate from binding to ACh. 
A)  The muscle action potential sweeps along the sarcolemma and calcium ions are released from the sarcoplasmic reticulum. 
B)  Crossbridge attachments form, and repetitive power strokes occur. 
C)  The level of Ca2+ in the sarcoplasm decreases, because it is being actively transported back into the sarcoplasmic reticulum and bound to calsequestrin. 
D)  The muscle fiber relaxes as myosin heads detach from the actin filaments. 
E)  Acetylcholinesterase is preventing the ligand gated channels at the motor end plate from binding to ACh. A

Question 2

In the diagram, where is the muscle fiber located?

Accepted Answer

A)  E 
B)  F 
C)  G 
D)  B 
E)  I 
A)  E 
B)  F 
C)  G 
D)  B 
E)  I B

Question 3

After the fusion of myoblasts, the muscle fiber loses its ability to do what?

Accepted Answer

A)  grow 
B)  lengthen 
C)  contract 
D)  go through mitosis 
E)  all of these choices 
A)  grow 
B)  lengthen 
C)  contract 
D)  go through mitosis 
E)  all of these choices D

Question 4

The signal to excite a muscle cell must cross the neuromuscular junction by the diffusion of acetylcholine across the

Accepted Answer

A)  motor neuron axon. 
B)  synaptic cleft. 
C)  sarcolemma. 
D)  synaptic vesicles. 
E)  myofibril. 
A)  motor neuron axon. 
B)  synaptic cleft. 
C)  sarcolemma. 
D)  synaptic vesicles. 
E)  myofibril.

Question 5

In the diagram, what letter indicates a triad?

Accepted Answer

A)  G 
B)  E 
C)  D 
D)  F 
E)  C 
A)  G 
B)  E 
C)  D 
D)  F 
E)  C

Question 6

The different types of muscle tissue differ from each other by:

Accepted Answer

A)  microscopic anatomy 
B)  location 
C)  type of control 
D)  both microscopic anatomy and location 
E)  all of these choices 
A)  microscopic anatomy 
B)  location 
C)  type of control 
D)  both microscopic anatomy and location 
E)  all of these choices

Question 7

For every nerve that penetrates a skeletal muscle, there are in general how many arteries and veins?

Accepted Answer

A)  one artery and one or two veins 
B)  two arteries and two veins 
C)  three arteries and two veins 
D)  one artery and three veins 
E)  one artery and a varied amount of veins 
A)  one artery and one or two veins 
B)  two arteries and two veins 
C)  three arteries and two veins 
D)  one artery and three veins 
E)  one artery and a varied amount of veins

Question 8

In the diagram, where is the skeletal muscle fiber?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 9

This is also referred to as the period of lost excitability.

Accepted Answer

A)  refractory period 
B)  contraction period 
C)  latent period 
D)  relaxation period 
E)  wave summation 
A)  refractory period 
B)  contraction period 
C)  latent period 
D)  relaxation period 
E)  wave summation

Question 10

A single, brief contraction of all muscle fibers in a motor unit in response to a single action potential is called:

Accepted Answer

A)  recovery oxygen uptake 
B)  motor unit movement 
C)  muscle fatigue 
D)  refractory period 
E)  twitch contraction 
A)  recovery oxygen uptake 
B)  motor unit movement 
C)  muscle fatigue 
D)  refractory period 
E)  twitch contraction

Question 11

In the diagram, what is made from dense regular connective tissue?

Accepted Answer

A)  A 
B)  H 
C)  C 
D)  D 
E)  All of these choices 
A)  A 
B)  H 
C)  C 
D)  D 
E)  All of these choices

Question 12

These are the contractile organelles of the muscle fiber.

Accepted Answer

A)  myofibrils 
B)  myoglobin 
C)  mitochondria 
D)  Z disc 
E)  M line 
A)  myofibrils 
B)  myoglobin 
C)  mitochondria 
D)  Z disc 
E)  M line

Question 13

Calcium ions bind to the ___ molecule in skeletal muscle cells.

Accepted Answer

A)  actin 
B)  troponin 
C)  tropomyosin 
D)  myosin 
E)  titin 
A)  actin 
B)  troponin 
C)  tropomyosin 
D)  myosin 
E)  titin

Question 14

Which of the following is NOT a correct structure and tissue type pairing?

Accepted Answer

A)  endomysium : loose areolar connective tissue 
B)  perimysium : dense irregular connective tissue 
C)  tendon : dense regular connective tissue 
D)  sarcolemma : loose areolar connective tissue 
E)  epimysium: dense irregular connective tissue 
A)  endomysium : loose areolar connective tissue 
B)  perimysium : dense irregular connective tissue 
C)  tendon : dense regular connective tissue 
D)  sarcolemma : loose areolar connective tissue 
E)  epimysium: dense irregular connective tissue

Question 15

Myofibrils contain

Accepted Answer

A)  contractile proteins. 
B)  regulatory proteins. 
C)  structural proteins. 
D)  all of these choices. 
E)  none of these choices. 
A)  contractile proteins. 
B)  regulatory proteins. 
C)  structural proteins. 
D)  all of these choices. 
E)  none of these choices.

Question 16

Hypertrophy is

Accepted Answer

A)  an increase in the size of muscle fibers. 
B)  a decrease in the size of muscle fibers. 
C)  an increase in the number of muscle fibers. 
D)  a decrease in the number of muscle fibers. 
E)  a loss in size and strength of muscle fibers. 
A)  an increase in the size of muscle fibers. 
B)  a decrease in the size of muscle fibers. 
C)  an increase in the number of muscle fibers. 
D)  a decrease in the number of muscle fibers. 
E)  a loss in size and strength of muscle fibers.

Question 17

This consists of a somatic motor neuron plus all the skeletal muscle fibers it stimulates.

Accepted Answer

A)  sarcomere 
B)  motor unit 
C)  neuromuscular junction 
D)  somatic motor neuron 
E)  muscle fiber 
A)  sarcomere 
B)  motor unit 
C)  neuromuscular junction 
D)  somatic motor neuron 
E)  muscle fiber

Question 18

How many molecules of acetylcholine need to bind to open the ion channel of the ACh receptor?

Accepted Answer

A)  34 
B)  5 
C)  10 
D)  an unknown amount 
E)  2 
A)  34 
B)  5 
C)  10 
D)  an unknown amount 
E)  2

Question 19

During isotonic contraction, the heavier the load, the faster the velocity of muscle shortening.

Accepted Answer

A) True 
 B)False

Question 20

Which structure on this diagram allows free movement of muscles, carries nerves, blood vessels and lymphatic vessels and fills spaces between whole muscles.

Accepted Answer

A)  A 
B)  B 
C)  E 
D)  G 
E)  H 
A)  A 
B)  B 
C)  E 
D)  G 
E)  H

Exam 10: Muscle Tissue

What is occurring during this period of a muscle twitch contraction?

In the diagram, where is the muscle fiber located?

After the fusion of myoblasts, the muscle fiber loses its ability to do what?

The signal to excite a muscle cell must cross the neuromuscular junction by the diffusion of acetylcholine across the

In the diagram, what letter indicates a triad?

The different types of muscle tissue differ from each other by:

For every nerve that penetrates a skeletal muscle, there are in general how many arteries and veins?

In the diagram, where is the skeletal muscle fiber?

This is also referred to as the period of lost excitability.

A single, brief contraction of all muscle fibers in a motor unit in response to a single action potential is called:

In the diagram, what is made from dense regular connective tissue?

These are the contractile organelles of the muscle fiber.

Calcium ions bind to the ___ molecule in skeletal muscle cells.

Which of the following is NOT a correct structure and tissue type pairing?

Myofibrils contain

Hypertrophy is

This consists of a somatic motor neuron plus all the skeletal muscle fibers it stimulates.

How many molecules of acetylcholine need to bind to open the ion channel of the ACh receptor?

During isotonic contraction, the heavier the load, the faster the velocity of muscle shortening.

Which structure on this diagram allows free movement of muscles, carries nerves, blood vessels and lymphatic vessels and fills spaces between whole muscles.

An Introduction to the Human Body

The Chemical Level of Organization

The Cellular Level of Organization

The Tissue Level of Organization

The Integumentary System

Introduction to the Skeletal System

The Axial Skeleton

The Appendicular Skeleton

Articulations

The Muscular System

Introduction to the Nervous System

The Central Nervous System

The Peripheral Nervous System

Sensory, Motor, and Integrative Systems

The Special Senses

The Endocrine System

The Cardiovascular System: the Blood

The Cardiovascular System: the Heart

The Cardiovascular System: Blood Vessels

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

The Urinary System

The Reproductive Systems and Development

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